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The check engine light is on to tell you that the ECU has detected a fault. The faults are stored as codes. The codes both have to do with a deficiency of exhaust gas going through the EGR valve. You will need to find out if the problem has to do with the valve, a leak, or the circuit.

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Code340 means the computer is not getting a signal from the cam sensor for one bank. Since you replaced the sensor, and given the fact one side has no compression, it could be that there is no signal because that cam is not turning.

p-0129 obd2 code means barometric pressure is out of range p-0339 says crankshaft position (ckp) sensor is intermittent.. go to auto zone .com and type in your vechile info and then look for a ckp sensor buy and replace.your pressure is off because of a bad sensor. disconect the neg on your battery, add new sensor, replace neg terminal back on battery.. then erase the two codes with a obd 2 code reader after installing new sensor. if you dont have a code reader pick one up at auto zone as well. its the best tool u can have.. no one will rip you off at the shop when you walk in their knowing what the problem is.. and you cant put a price on knowlage.. oh wait you can $ 49.99